Soil organic carbon induces a decrease in erodibility of black soil with loess parent materials in northeast China
Soil organic carbon induces a decrease in erodibility of black soil with loess parent materials in northeast China
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DOI：
10.1017/qua.2023.58
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发表时间：
2023-12
影响因子：
2.3
通讯作者：
Jingyi Cui;Licheng Guo;S. Xiong;Shiling Yang;Yongda Wang;Shihao Zhang;Hui Sun
中科院分区：
文献类型：
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作者：
Jingyi Cui;Licheng Guo;S. Xiong;Shiling Yang;Yongda Wang;Shihao Zhang;Hui Sun
虽然东北黑土遭受严重的侵蚀，但母质（主要是第四纪黄土和非黄土沉积物）对土壤可蚀性的贡献尚不清楚。考虑到母质对铁磁性物质的遗传，磁性参数的变化可以成功地确定具有密切气候背景的区域尺度上的土壤可蚀性。本文对东北地区重度和轻度侵蚀的黄土和非黄土沉积物形成的142个黑土层样品的磁性指标进行了分析，以确定母质对黑土可蚀性的影响。低频磁化率和频率磁化率（χfd）均与铁磁物质侵蚀淋洗导致的侵蚀速率降低成正比，而黄土母质黑土的χfd变化较小，土壤可蚀性相对较低。与黄土相比，土壤有机质的添加可以稳定土壤的抗侵蚀能力，从而导致在黄土上形成的黑土的可蚀性降低。此外，在保持粮食高产和防止水土流失的压力下，制定可持续的土壤管理政策以保护黑土免受进一步侵蚀是必要和迫切的。
Although black soil in northeast China undergoes severe erosion, the contribution of parent materials, mainly Quaternary loess and non-loess sediments, to soil erodibility remains unclear. Considering the inheritance of ferromagnetic materials by parent materials, changes in magnetic parameters can successfully determine soil erodibility on a regional scale with a close climatic background. Here, we analysed the magnetic indicators of 142 samples from the black soil horizon formed on loess and non-loess sediments, covering areas of severe and slight erosion in the region to determine the effects of parent materials on the erodibility of black soil in northeast China. Both low-frequency magnetic susceptibility and frequency magnetic susceptibility (χfd) were proportional to the decrease in erosion rate due to erosion-induced leaching of ferromagnetic materials, and the change in χfd was narrow for black soil with loess parent materials, corresponding to relatively low soil erodibility. Compared with loess, the addition of soil organic matter could stabilise soils against erosion, thereby inducing a decrease in the erodibility of black soil formed on loess. Additionally, sustainable soil management policies to protect black soil from further erosion are necessary and urgent under the pressure of maintaining high grain yields and preventing erosion in northeast China.